How many electrons, protons and photons are involved in the lysis of water to evolve one molecule of oxygen?

1.
How many electrons, protons and photons are involved in the lysis of water to evolve one molecule of oxygen?

1. 4e–, 4H+ and 4 photons2. 4e–, 4H+ and 8 photons3. 2e–, 2H+ and 8 photons4. 2e–, 2H+ and 4 photons